JP7511238B2 - Pipe joint and manufacturing method thereof - Google Patents

Description

The present invention relates to a pipe fitting and a method for manufacturing a pipe fitting.

Patent Document 1 discloses a pipe joint that includes a pipe, a nipple, and a socket. In the pipe joint of Patent Document 1, the pipe and nipple are arranged inside a cylindrical socket. Inside the socket, the flare portion of the pipe and the nipple flange portion of the nipple abut against each other. The flare portion of the pipe is crimped and fixed to the inner surface of the socket on the opposite side to the nipple flange portion. The portion of the inner surface of the socket that is crimped and fixed to the flare portion of the pipe has an uneven shape, which makes it difficult for the pipe to rotate.

JP 2019-100376 A

Conventionally, in order to fix a pipe joint to an automobile part or the like, a metal member such as a bracket that can be screwed onto the outside of a socket has been used. Such a metal member is attached along the circumferential outer surface of the socket via a tubular rubber member. For this reason, the metal member is prone to rotating along the outer surface of the socket.

The present invention aims to provide a pipe fitting and a method for manufacturing a pipe fitting that can suppress rotation of the pipe and the resin or metal member arranged on the outside of the socket.

The pipe joint of the present invention comprises a pipe, a cylindrical nipple, a cylindrical socket with the pipe and the nipple disposed inside, and a resin or metal member disposed outside the socket. The pipe has a pipe body and a pipe flare formed at the end of the pipe body and wider than the outer diameter of the pipe body. The nipple has a nipple body and a nipple flange formed at the end of the nipple body and having an outer diameter larger than that of the nipple body. The pipe flare and the nipple flange abut on the inside of the socket. The socket has a first wall and a second wall disposed between the pipe flare and the nipple flange in the axial direction of the socket. The socket has a portion that overlaps with the pipe body in the radial direction and is fixed to the pipe body by crimping radially inward, forming a recess on the outer peripheral surface of the socket, and a protrusion that fits into the recess is formed in the resin or metal member.

The manufacturing method of the pipe joint of the present invention is a manufacturing method of a pipe joint including a pipe having a pipe body portion and a pipe flare portion, a nipple having a nipple body portion and a nipple flange portion, a socket in which the pipe and the nipple are arranged, and a metal member arranged on the outside of the socket, and includes a first step of arranging the pipe and the nipple inside the socket and abutting the pipe flare portion and the nipple flange portion, and a second step of abutting the wall portion of the socket on the opposite side of the pipe flare portion with respect to the nipple flange portion. The method includes a second step of plastically deforming the socket by pressing it against the nipple flange, and a third step of placing a tubular portion of a metal member on the outside of the portion of the socket that overlaps radially with the pipe body, and then pressing the tubular portion radially inward to crimp and fix the portion of the socket that overlaps radially with the pipe body to the pipe body radially inward, forming a recess on the outer circumferential surface of the socket, and forming a metal member having a metal tubular portion with a protrusion that fits into the recess.

From another perspective, the method for manufacturing a pipe joint of the present invention is a method for manufacturing a pipe joint including a pipe having a pipe body portion and a pipe flare portion, a nipple having a nipple body portion and a nipple flange portion, a socket in which the pipe and the nipple are arranged, and a resin member arranged on the outside of the socket, the method comprising a first step of arranging the pipe and the nipple inside the socket and abutting the pipe flare portion against the nipple flange portion, and a second step of abutting the pipe flare portion against the nipple flange portion against a wall portion of the socket on the opposite side of the pipe flare portion with respect to the nipple flange portion. a second step of plastically deforming the socket by pressing it against the nipple flange; a third step of crimping the portion of the socket that overlaps radially with the pipe body toward the inside of the pipe body to form a recess in the outer circumferential surface of the socket; and a fourth step of placing the crimped portion of the socket in a mold, injecting molten resin material into the mold, and solidifying the resin material with the recess filled with the molten resin material to form a resin member having a protrusion that fits into the recess.

The pipe fitting of the present invention can suppress rotation of the pipe and rotation of the resin member or metal member arranged on the outside of the socket. The manufacturing method of the pipe fitting of the present invention can obtain a pipe fitting that can suppress rotation of the pipe and rotation of the resin member or metal member arranged on the outside of the socket.

FIG. 1 is a half-sectional view of a pipe joint according to a first embodiment of the present invention. 1A is a half-side cross-sectional view of a pipe, FIG. 1B is a half-side cross-sectional view of a nipple, FIG. 1C is a half-side cross-sectional view of a socket and a hose, and FIG. FIG. 2 is an external view of the pipe joint with the resin member omitted. 1A to 1C are half-sectional views showing a manufacturing method of a joint with a pipe in sequence (first step: before pipe insertion). 1A to 1C are half-sectional views showing a manufacturing method of a pipe joint in sequence (first step: before inserting a nipple). 1A to 1C are half-sectional views sequentially showing a method for manufacturing a pipe joint (second step: before plastic deformation of the socket). 1A to 1C are half-sectional views sequentially showing a method for manufacturing a pipe joint (after the second step: plastic deformation of the socket). 10A to 10C are half-sectional views showing the manufacturing method of the pipe joint in sequence (after the third step: socket crimping and fixing). 10A to 10C are half-sectional views sequentially illustrating a method for manufacturing a pipe joint (during a fourth step: forming a resin member). 10A to 10C are half-sectional views sequentially illustrating a method for manufacturing a pipe joint (after the fourth step: forming the resin member). 10A to 10C are half-sectional views (after a hose is inserted) sequentially illustrating a method for manufacturing a pipe joint. FIG. 5 is a perspective view of a pipe joint according to a second embodiment of the present invention. FIG. 6 is a front view of a pipe joint according to a second embodiment of the present invention. 14A is a perspective view of the metal member shown in FIG. 12 and FIG. 13, FIG. 14B is a view seen from the b direction of FIG. 14A, and FIG. 14C is a view seen from the c direction of FIG. FIG. 5 is a half-sectional view of a pipe joint according to a second embodiment of the present invention. FIG. 2 is an external view of a pipe joint with metal members omitted. 10A to 10C are half-sectional views sequentially showing a method for manufacturing a pipe joint according to a second embodiment (first step: before pipe insertion). 10A to 10C are half-sectional views sequentially showing a method for manufacturing a pipe joint according to a second embodiment (first step: before inserting a nipple). 10A to 10C are half-sectional views sequentially showing a method for manufacturing a pipe joint according to a second embodiment (second step: before socket plastic deformation). 10A to 10C are half-sectional views sequentially showing a method for manufacturing a pipe joint according to a second embodiment (second step: after socket plastic deformation). 10A to 10C are half-sectional views sequentially showing a method for manufacturing a pipe joint according to a second embodiment (third step: before pressing the cylindrical portion). 10A to 10C are half-sectional views sequentially showing a method for manufacturing a pipe joint according to a second embodiment (after a third step: pressing the cylindrical portion). 10A to 10C are half-sectional views (before a hose is inserted) sequentially illustrating a method for manufacturing a pipe joint according to a second embodiment. 10A to 10C are half-sectional views (after a hose is inserted) sequentially illustrating a method for manufacturing a pipe joint according to a second embodiment.

First Embodiment
Here, a pipe fitting according to a first embodiment of the present invention will be described below with reference to Figures 1 to 11. Figure 1 shows a pipe fitting 1 to which a hose 10 is connected. The pipe fitting 1 comprises a pipe 2, a nipple 3, a socket 4, and a resin member 5. The pipe 2 and nipple 3 are arranged inside the socket 4. The resin member 5 is arranged outside the socket 4. The axial direction of the pipe 2, the axial direction of the nipple 3, and the axial direction of the socket 4 are substantially the same. Hereinafter, the axial direction of the pipe 2, the axial direction of the nipple 3, and the axial direction of the socket 4 may be simply referred to as the "axial direction".

Figure 2 (a) to (d) show half-side cross-sectional views of each of the components that make up the pipe joint 1 and a half-side cross-sectional view of the hose 10.

As shown in FIG. 2(a), the pipe 2 has a pipe main body 21 and a pipe flare portion 22. The pipe 2 is cylindrical. The pipe flare portion 22 is formed at the end of the pipe main body 21. The width of the pipe flare portion 22 is larger than the outer diameter of the pipe main body 21. The width of the pipe flare portion 22 increases with increasing distance from the pipe main body 21 in the axial direction of the pipe 2. The width of the pipe flare portion 22 is the length in a direction perpendicular to the axial direction of the pipe 2.

As shown in FIG. 2(b), the nipple 3 has a nipple body 31 and a nipple flange 32. The nipple 3 is cylindrical. The nipple flange 32 is formed at the end of the nipple body 31. The outer diameter of the nipple flange 32 is larger than the outer diameter of the nipple body 31.

As shown in FIG. 2(c), the socket 4 is cylindrical. The socket 4 has a first wall portion 41 and a second wall portion 42.

As shown in FIG. 1, the pipe 2 and nipple 3 are arranged inside the socket 4. The pipe flare portion 22 and the nipple flange portion 32 abut inside the socket 4. The pipe flare portion 22 and the nipple flange portion 32 are sandwiched between the first wall portion 41 and the second wall portion 42 of the socket 4 in the axial direction of the socket 4. This connects the pipe 2, nipple 3, and socket 4.

The first wall portion 41 of the socket 4 abuts against the back surface 22a of the pipe flare portion 22. The "back surface 22a" of the pipe flare portion 22 refers to the surface 22a of the pipe flare portion 22 that is located on the opposite side to the nipple flange portion 32.

The second wall portion 42 of the socket 4 abuts against the back surface 32a of the nipple flange portion 32. The "back surface 32a" of the nipple flange portion 32 is the surface 32a of the nipple flange portion 32 that is located on the opposite side to the pipe flare portion 22. The second wall portion 42 is crimped and fixed to the nipple flange portion 32 in the axial direction of the socket 4.

In the axial direction of the socket 4, the hose 10 is disposed closer to the nipple body 31 than the second wall 42. The hose 10 is disposed between the socket 4 and the nipple body 31.

In FIG. 1, the portion of the socket 4 that overlaps radially with the hose 10 is shown as the "hose overlap portion 4x," and the portion that overlaps radially with the pipe main body portion 21 is shown as the "pipe overlap portion 4y."

The hose overlap portion 4x is pressed radially toward the hose 10, forming recesses 4a and 4b in the hose overlap portion 4x. By pressing the hose overlap portion 4x, the hose 10 is fastened to the pipe joint 1.

The pipe overlapping portion 4y is fixed to the pipe main body 21 by crimping in the radial direction. As a result, a plurality of recesses 4A, 4B, and 4C are formed on the outer peripheral surface of the pipe overlapping portion 4y (see Fig. 2(c) and Fig. 3). As shown in Fig. 3, the plurality of recesses 4A, 4B, and 4C are arranged at intervals in the circumferential direction of the socket 4. By crimping the pipe overlapping portion 4y to the pipe main body 21, rotation of the pipe 2 is suppressed. In Fig. 3, the pipe 2, socket 4, and hose 10 are shown, and the nipple 3 and resin member 5 are omitted.

As shown in FIG. 1, the resin members 5 are arranged on the outside of the portion of the socket 4 that overlaps radially with the pipe main body 21, the outside of the portion that overlaps radially with the pipe flare portion 22, the outside of the portion that overlaps radially with the nipple flange portion 32, and the outside of the portion that overlaps radially with the second wall portion 42. In the socket 4, the resin members 5 are not arranged on the outside of the hose overlap portion 4x. Therefore, the resin members 5 are not arranged on the outside of the recesses 4a and 4b of the socket 4 either.

The resin member 5 has a protrusion 5A formed thereon that fits into the recess 4A of the socket 4 (see FIG. 2(d)). In addition to the protrusion 5A, the resin member 5 also has protrusions (not shown) formed thereon that fit into other recesses of the socket 4 (e.g., recess 4B and recess 4C in FIG. 3). The resin member 5 has the same number of protrusions formed thereon as the recesses of the socket 4. The resin member 5 is made of polyamide or the like.

As shown in FIG. 1, a screw hole 5a is formed in the resin member 5. The pipe fitting 1 can be attached to an automobile part or the like by screwing the resin member 5 to the automobile part or the like.

Next, a method for manufacturing the pipe joint 1 will be described with reference to FIGS.
In the above, the socket connected to the pipe 2 and nipple 3 is referred to as "socket 4", but below, the socket before being connected to the pipe 2 and nipple 3 is referred to as "socket 104", and the socket connected to the pipe 2 and nipple 3 is referred to as "socket 4" as above. Below, first, the configuration of the "socket 104" before being connected to the pipe 2 and nipple 3 will be described, and then the manufacturing method of the pipe fitting 1 will be described. In the description of the socket 104, the same reference numerals will be used for the same configuration as the socket 4, and the description thereof will be omitted as appropriate.

As shown in FIG. 4, the socket 104 has a first wall portion 41, a third wall portion 143, and a fourth wall portion 144. The inner diameter increases in the order of the first wall portion 41, the third wall portion 143, and the fourth wall portion 144. The first wall portion 41, the third wall portion 143, and the fourth wall portion 144 form the inner wall of the socket 104 in a three-step staircase shape.

As shown in FIG. 4, first, insert the pipe 2 into the socket 104 from the pipe body portion 21, and bring the back surface 22a of the pipe flare portion 22 into contact with the first wall portion 41 of the socket 104 (see FIG. 5).

Next, the nipple 3 is inserted into the socket 104 from the nipple flange 32, and the nipple flange 32 is brought into contact with the pipe flare portion 22 (first step, see Figure 6).

As a result of the above, as shown in FIG. 6, the pipe flare portion 22 abuts against the first wall portion 41, and the pipe flare portion 22 and the nipple flange portion 32 abut against each other. In this state, an axial force is applied to the third wall portion 143 of the socket 104 using a tool or the like. This causes a portion 143p of the third wall portion 143 to plastically deform, forming the second wall portion 42 (second process, see FIG. 7).

As shown in FIG. 7, the pipe flare portion 22 and the nipple flange portion 32 are sandwiched between the first wall portion 41 and the second wall portion 42. The second wall portion 42 is crimped and fixed to the nipple flange portion 32 in the axial direction of the socket 4. This connects the pipe 2, nipple 3, and socket 4.

Next, in order to prevent the pipe 2 from rotating, the pipe overlapping portion 4y of the socket 4 is crimped and fixed to the pipe body portion 21 toward the radial inside of the socket 4. This forms a recess 4A in the pipe overlapping portion 4y (third step, see Figure 8).

Next, in order to form the resin member 5 on the outside of the socket 4, the pipe overlapping portion 4y of the socket 4 and its vicinity are placed in a mold 200. Thereafter, as shown in FIG. 9, molten resin material 105 is injected into the mold 200, and the recess 4A of the socket 4 is filled with the molten resin material 105. The other recesses of the socket 4 (for example, recess 4B and recess 4C in FIG. 3) are also filled with the molten resin material 105. In this state, the resin material 105 is solidified. When the resin material 105 solidifies, the resin member 5 is formed.

Figure 10 shows the pipe fitting 1 removed from the mold 200. A resin member 5 is formed on the outside of the socket 4. A protrusion 5A that fits into the recess 4A of the socket 4 is formed on the resin member 5 (fourth step). The resin member 5 also has protrusions (not shown) that fit into other recesses of the socket 4 (e.g., recess 4B and recess 4C in Figure 3).

When connecting the hose 10 to the pipe joint 1, the hose 10 is inserted between the socket 4 and the nipple body 31. As shown in FIG. 11, the hose overlap portion 4x of the socket 4 is pressed radially, thereby fastening the hose 10 to the pipe joint 1 (see FIG. 1).

As described above, the pipe fitting 1 of this embodiment provides the following advantages:

As shown in Fig. 7, the pipe overlapping portion 4y of the socket 4 is crimped and fixed in the radial direction. This prevents the pipe 2 from rotating. Furthermore, by crimping and fixing the pipe overlapping portion 4y, a recess 4A is formed on the outer circumferential surface of the pipe overlapping portion 4y (see Fig. 8). The protrusion 5A of the resin member 5 fits into this recess 4A (see Fig. 1). As a result, when a force is applied to the resin member 5 in a rotational direction, the protrusion 5A gets caught on the socket 4, preventing the resin member 5 from rotating.
In this manner, by utilizing the recess 4A formed by crimping and fixing the socket 4, rotation of the resin member 5 can be suppressed in order to suppress rotation of the pipe 2.
As described above, according to the pipe fitting 1 of the present embodiment, rotation of the pipe 2 and rotation of the resin member 5 can be suppressed.

In addition, as shown in Figures 1 and 2, the pipe 2 and nipple 3 are separate parts, so the pipe 2 and nipple 3 can be machined separately. For example, by forging the nipple 3 separately, it becomes easy to reduce the outer diameter of the nipple 3 while maintaining the inner diameter at a specified diameter. Also, because only the nipple 3 is machined separately, there is little variation in the axial length after reduction. Therefore, there is no need to process the axial length to be uniform. Also, the nipple 3 does not have an axial seam (joint) like the pipe 2. Therefore, the liquid inside does not leak through the seam.

Also, in the above, the method of insert molding has been described as a method of producing the resin member 5. Specifically, as shown in Fig. 9, the socket 4 to which the pipe 2 and the nipple 3 are connected is placed in the mold 200, and the molten resin material 105 is injected into the mold 200, and the resin material 105 is solidified in a state in which the recess 4A of the socket 4 is filled with the molten resin material 105. In this way, the resin member 5 is formed on the outside of the socket 4.
By forming the resin member 5 by the above method, as shown in FIG. 1, the convex portion 5A of the resin member 5 is formed along the shape of the concave portion 4A of the socket 4. There is almost no gap between the convex portion 5A of the resin member 5 and the wall portion defining the concave portion 4A of the socket 4. Therefore, the convex portion 5A of the resin member 5 hardly moves in the concave portion 4A of the socket 4. As a result, even if a force in the rotational direction and/or a force along the axial direction of the socket 4 is applied to the resin member 5, the resin member 5 hardly moves. In addition, since there is almost no gap between the convex portion 5A of the resin member 5 and the wall portion defining the concave portion 4A of the socket 4, liquid, foreign matter, etc. hardly penetrate between the convex portion 5A of the resin member 5 and the wall portion defining the concave portion 4A of the socket 4. Therefore, corrosion of the wall portion defining the concave portion 4A of the socket 4 can be suppressed.

As shown in FIG. 3, a plurality of recesses 4A, 4B, and 4C are formed in the pipe overlap portion 4y of the socket 4. The plurality of recesses 4A, 4B, and 4C are arranged at intervals in the circumferential direction of the socket 4. The plurality of protrusions of the resin member 5 fit into the plurality of recesses 4A, 4B, and 4C, respectively, so that the resin member 5 is caught on the socket 4 at a plurality of points in the circumferential direction of the socket 4. This makes it more difficult for the resin member 5 to rotate.

As shown in FIG. 1, the resin member 5 is disposed on the outside of the portion of the socket 4 that overlaps radially with the pipe 2, the outside of the portion that overlaps radially with the nipple flange portion 32, and the outside of the portion that overlaps radially with the second wall portion 42. In the socket 4, the resin member 5 is not disposed on the outside of the hose overlap portion 4x. In other words, there is an area in the hose overlap portion 4x that can be pressed from the radial outside. By pressing this area radially inward, the hose 10 can be fastened to the pipe fitting 1.

The resin member 5 shown in FIG. 1 is made of resin and is therefore lightweight. Therefore, by using the resin member 5, the weight of the pipe joint 1 can be reduced. Also, since the resin member 5 is made of resin, there is a high degree of freedom in the shape. Note that a metal collar or the like may be fitted into the screw hole 5a of the resin member 5.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to Figures 12 to 24. The second embodiment differs from the first embodiment in that a metal member 305 is used instead of the resin member 5. Note that the same components as those in the first embodiment described above are designated by the same reference numerals, and descriptions thereof will be omitted as appropriate.

As shown in Figs. 12 and 13, the pipe joint 301 according to the second embodiment includes a pipe 2, a nipple 3 (not shown in Fig. 15), a socket 304, and a metal member 305. A hose 10 is fastened to the pipe joint 301 shown in Figs. 12 and 13.

The metal member 305 is shown in Figs. 14(a) to (c). As shown in Figs. 14(a) to (c), the metal member 305 has a metal tube portion 305F, an intermediate portion 305G, and a bracket 305H. The metal tube portion 305F, the intermediate portion 305G, and the bracket 305H are integrally molded. The metal tube portion 305F and the intermediate portion 305G are connected so that the hole of the metal tube portion 305F communicates with the hole of the intermediate portion 305G. The bracket 305H is connected to the intermediate portion 305G. A screw hole 305a is formed in the bracket 305H. The metal member 305 is made of metal. Examples of the material of the metal member 305 include cold rolled steel plate (SPCC) and hot rolled steel plate (SPHC). Note that the material of the metal member 305 is not limited to these.

As shown in Figures 14(a) and 14(c), a plurality of recesses 305s, 305t, 305u, 305v, and 305w are formed on the outer surface of the metal tube portion 305F. The plurality of recesses 305s, 305t, 305u, 305v, and 305w are arranged at intervals in the circumferential direction of the socket 4.

Figure 15 shows a cross-sectional view of the pipe joint 301. As shown in Figure 14, the metal tube portion 305F of the metal member 305 is disposed on the outside of the portion of the socket 304 that overlaps radially with the pipe main body 21. In the socket 304, the metal member 305 is not disposed on the outside of the hose overlap portion 4x. The bracket 305H is disposed on the opposite side of the hose overlap portion 4x to the pipe overlap portion 304y.

The metal tube portion 305F is fixed to the pipe overlap portion 304y by crimping toward the inside of the radial direction. This prevents the metal tube portion 305F from rotating.

The pipe overlap portion 304y is fixed to the pipe main body portion 21 by crimping toward the inside of the radial direction. This prevents the pipe 2 from rotating.

The outer surface of the metal tube portion 305F is formed with recesses 305s, 305t, 305u, 305v, and 305w (see FIG. 13). They are spaced apart from each other in the circumferential direction of the metal tube portion 305F.

As shown in FIG. 16, a plurality of recesses 304A, 304B, 304C, 304D, and 304E are formed on the outer peripheral surface of the pipe overlapping portion 304y. The plurality of recesses 304A, 304B, 304C, 304D, and 304E are arranged at intervals in the circumferential direction of the socket 4. In FIG. 16, the pipe 2, the socket 304, and the hose 10 are shown, and the nipple 3 and the metal member 305 are omitted.

The protrusions (see "protrusions 305A" in FIG. 15) formed on the metal tube portion 305F fit into each of the multiple recesses 304A, 304B, 304C, 304D, and 304E. This connects the metal tube portion 305F to the pipe overlap portion 304y of the socket 304.

Figure 15 shows the projection 305A fitted into the recess 304A, but the other recesses (such as recess 304B, recess 304C, recess 304D, and recess 304E shown in Figure 16) also have projections (not shown) formed on the metal tube 305F fitted into them. The same number of projections are formed on the metal tube 305F as there are recesses on the socket 304.

Next, a method for manufacturing the pipe joint 301 will be described with reference to Figures 17 to 22. In the above, the socket connected to the pipe 2 and nipple 3 is referred to as "socket 304", but in the following, the socket before being connected to the pipe 2 and nipple 3 is referred to as "socket 104", and the socket connected to the pipe 2 and nipple 3 is referred to as "socket 304" as above. In the following description of "socket 104", the same reference numerals are used for the same configuration as "socket 304", and their description will be omitted as appropriate. In addition, the metal member connected to the socket 304 is referred to as "metal member 305", but in the following, the metal member before being connected to the socket 304 is referred to as "metal member 405", and the metal member connected to the socket 304 is referred to as "metal member 305". In the description of "metal member 405", the same reference numerals are used for the same configuration as "metal member 305", and their description will be omitted as appropriate.

As shown in FIG. 17, first, the pipe 2 is inserted into the socket 104 from the pipe body portion 21, and the rear surface 22a of the pipe flare portion 22 is brought into contact with the first wall portion 41 of the socket 104 (first step, see FIG. 18).

Next, the nipple 3 is inserted into the socket 104 from the nipple flange portion 32, and the nipple flange portion 32 is brought into contact with the pipe flare portion 22 (first step, see Figure 19).

As a result of the above, as shown in FIG. 19, the pipe flare portion 22 abuts against the first wall portion 41, and the pipe flare portion 22 and the nipple flange portion 32 abut against each other. In this state, an axial force is applied to the third wall portion 143 of the socket 104 using a tool or the like. This causes a portion 143p of the third wall portion 143 to plastically deform, forming the second wall portion 42 (second process, see FIG. 20).

As shown in FIG. 20, the pipe flare portion 22 and the nipple flange portion 32 are sandwiched between the first wall portion 41 and the second wall portion 42. The second wall portion 42 is crimped and fixed to the nipple flange portion 32 in the axial direction of the socket 4. This connects the pipe 2, nipple 3, and socket 304.

Next, the tubular portion 405F of the metal member 405 is placed on the outside of the pipe overlap portion 304y of the socket 4 (third step, see FIG. 21). Then, the tubular portion 405F is pressed radially inward. As a result, as shown in FIG. 22, the metal tubular portion 305F is crimped and fixed to the socket 304 radially inward, and the socket 304 is crimped and fixed to the pipe body portion 21 of the pipe 2 radially inward. In addition, the recesses 305s, 305u, 305v, and 305w are formed on the outer surface of the metal tubular portion 305F. The recess 304A is formed in the pipe overlap portion 304y, and the protrusion 305A fitted into the recess 304A is formed on the inner surface of the metal tubular portion 305F (third step). Although not shown in FIG. 22, other recesses (e.g., recesses 305t and 305u shown in FIG. 14(c)) are also formed on the outer surface of metal tube portion 305F. Other recesses (e.g., recesses 304B, 304C, 304D, and 304E shown in FIG. 16) are formed in socket 304, and protrusions (not shown) that fit into these recesses are formed on the inner surface of metal tube portion 305F.

When connecting the hose 10 to the pipe joint 301, as shown in FIG. 23, the hose 10 is inserted between the socket 304 and the nipple portion 23. As shown in FIG. 24, the hose 10 is fastened to the pipe joint 301 by radially pressing the hose overlap portion 4x of the socket 304 (see FIG. 15).

In the pipe joint 301 according to the second embodiment, as shown in Fig. 14, the metal tube portion 305F is crimped to the pipe overlapping portion 304y of the socket 304 toward the radial inside, and the socket 4 is crimped to the pipe main body 21 toward the radial inside. A recess 304A is formed on the outer circumferential surface of the pipe overlapping portion 304y, and the protrusion 305A of the metal member 305 is fitted into this recess 304A. This suppresses the rotation of the metal tube portion 305F and the rotation of the pipe 2. For example, when a force in a rotational direction is applied to the metal member 305, the protrusions of the metal tube portion 305F are caught in the recesses of the socket 304, suppressing the rotation of the metal member 305.
As described above, according to the pipe joint 301 of the second embodiment, rotation of the pipe 2 and rotation of the metal member 305 can be suppressed.

In addition, as shown in FIG. 15, the pipe 2 and nipple 3 are separate parts, so the pipe 2 and nipple 3 can be machined separately. For example, by forging the nipple 3 separately, it becomes easy to reduce the outer diameter of the nipple 3 while maintaining the inner diameter at a specified diameter. Also, because only the nipple 3 is machined separately, there is little variation in the axial length after reduction. Therefore, there is no need to process the axial length to be uniform. Also, the nipple 3 does not have an axial seam (joint) like the pipe 2. Therefore, the liquid inside does not leak through the seam.

In addition, according to the manufacturing method of the pipe fitting 301 of the second embodiment, the tubular portion 405F of the metal member 405 is placed outside the pipe overlap portion 304y of the socket 4, and by pressing the pipe overlap portion 304y, the metal tubular portion 305F and the socket 4 can be crimped and fixed simultaneously. This simplifies the manufacturing process and reduces the number of manufacturing steps.

In addition, according to the manufacturing method of the pipe joint 301 of the second embodiment, the tubular portion 405F of the metal member 405 is pressed radially inward (see FIG. 21), so that, as shown in FIG. 22, there is almost no gap between the convex portion 305A of the metal tubular portion 305F and the wall portion defining the concave portion 304A of the socket 304. Therefore, the convex portion 305A of the metal tubular portion 305F hardly moves in the concave portion 304A of the socket 304. As a result, even if a force in a rotational direction and/or a force along the axial direction of the socket 4 is applied to the metal member 305, the metal member 305 hardly moves.

As shown in FIG. 15, a plurality of recesses 304A, 304B, 304C, 304D, and 304E are formed in the pipe overlap portion 304y of the socket 304. The plurality of recesses 304A, 304B, 304C, 304D, and 304E are arranged at intervals in the circumferential direction of the socket 304. The protruding portions of the metal member 305 fit into the plurality of recesses 304A, 304B, 304C, 304D, and 304E, respectively, so that the metal member 305 is caught by the socket 304 at a plurality of points in the circumferential direction of the socket 304. This makes it more difficult for the metal member 305 to rotate.

As shown in FIG. 15, the metal tube portion 305F of the metal member 305 is disposed on the outside of the portion (pipe overlap portion 304y) that radially overlaps with the pipe main body 21 in the socket 304. In the socket 304, the metal tube portion 305F is not disposed on the outside of the hose overlap portion 4x. In other words, there is an area in the hose overlap portion 4x that can be pressed from the radial outside. By pressing this area radially inward, the hose 10 can be fastened to the pipe fitting 301.

The bracket 305H of the metal member 305 shown in Figures 14(a) to (c) may be screwed to an automobile part or the like. At this time, a screw is inserted into the screw hole 305a, but since the metal member 305 is made of metal, the area around the screw hole 305a is not prone to creep. Therefore, the screw is not prone to loosening. A separate part such as a metal collar may be inserted into the screw hole 305a to prevent the screw from loosening, but when the metal member 305 is used, the screw is not prone to loosening, so a separate part such as a metal collar is not necessary.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration should not be considered to be limited to these embodiments. The scope of the present invention is indicated by the claims, not the above description, and includes all modifications within the meaning and scope of the claims.

For example, in the first embodiment, multiple recesses 4A, 4B, and 4C are formed in the pipe overlapping portion 4y of the socket 4. Also, in the second embodiment, multiple recesses 304A, 304B, 304C, 304D, and 304E are formed in the pipe overlapping portion 4y of the socket 304. However, the number of recesses can be changed. One, two, or three recesses may be formed in the pipe overlapping portion 4y, or four or more recesses may be formed.

In addition, in the first embodiment, the multiple protrusions of the resin member 5 fit into each of the multiple recesses 4A, 4B, and 4C of the socket 4. The resin member 5 has the same number of protrusions as the recesses of the socket 4. However, the number of protrusions formed on the resin member 5 may be less than the number of recesses formed on the socket, and the protrusions of the resin member 5 do not have to fit into all of the multiple recesses formed on the socket.

In addition, in the first embodiment, the multiple recesses 4A, 4B, and 4C formed in the socket 4 are arranged at intervals in the circumferential direction of the socket 4. In the second embodiment, the multiple recesses 304A, 304B, 304C, 304D, and 304E formed in the socket 304 are arranged at intervals in the circumferential direction of the socket 304. However, the multiple recesses formed in the socket may be arranged at intervals in the circumferential and/or axial direction of the socket.

In the first embodiment, the resin member 5 is disposed on the outside of a portion of the socket 4 that overlaps radially with the pipe main body 21, the outside of a portion of the socket 4 that overlaps radially with the pipe flare portion 22, the outside of a portion of the socket 4 that overlaps radially with the nipple flange portion 32, and the outside of a portion of the socket 4 that overlaps radially with the second wall portion 42. In the second embodiment, the metal tube portion 305F of the metal member 305 is disposed on the outside of a portion of the socket 4 that overlaps radially with the pipe main body 21.
However, the resin member 5 may be disposed only on the outside of the portion radially overlapping with the pipe main body 21. The resin member 5 and the metal member 305 may be disposed only on the outside of the portion radially overlapping with the pipe main body 21 and the outside of the portion radially overlapping with the pipe flare portion 22. The resin member 5 and the metal member 305 may be disposed only on the outside of the portion radially overlapping with the pipe main body 21, and the outside of the portion radially overlapping with the pipe flare portion 22 and the nipple flange portion 32. The metal tube portion 305F of the metal member 305 may be disposed on the socket, on the outside of the portion radially overlapping with the pipe main body 21, the outside of the portion radially overlapping with the pipe flare portion 22, the outside of the portion radially overlapping with the nipple flange portion 32, and the outside of the portion radially overlapping with the second wall portion 42. The resin member 5 and the metal member 305 may also be disposed on the outside of the hose overlap portion 4x.

In the first embodiment, the method of producing the resin member 5 by insert molding has been described. However, the resin member 5 may be produced by another method.

In addition, in the first embodiment, when the resin member 5 is manufactured, the recess 4A of the socket 4 is filled with the molten resin material 105, and the resin material 105 is solidified to form the protrusion 5A of the resin member 5. However, the method for forming the protrusion of the resin member 5 may be different.

In the second embodiment, as shown in Figs. 14(a) to (c), the metal tube portion 305F, the intermediate portion 305G, and the bracket 305H are integrally molded. However, the metal tube portion 305F, the intermediate portion 305G, and the bracket 305H may each be different members, and each member may be connected to another member by welding or the like. In this case, the metal member 305 is made up of three members. Also, the intermediate portion 305G may not be present, and the metal tube portion 305F and the bracket 305H may be integrally molded. Also, the metal tube portion 305F and the bracket 305H may be different members, and these may be connected by welding or the like. The shapes of the metal tube portion 305F, the intermediate portion 305G, and the bracket 305H are not limited to the shapes shown in Figs. 14(a) to (c).

In the second embodiment, the metal member 305 has the metal tube portion 305F, the middle portion 305G, and the bracket 305H. However, the metal member 305 may have the metal tube portion 305F and the bracket 305H, but may not have the middle portion 305G.

In the first and second embodiments, the outer and inner diameters of the pipe body 21 in the pipe 2 are larger than the outer and inner diameters of the nipple portion 23, respectively. However, the outer and inner diameters of the pipe body 21 may be the same as the outer and inner diameters of the nipple portion, respectively. The outer and inner diameters of the pipe body 21 may be smaller than the outer and inner diameters of the nipple portion, respectively.

REFERENCE SIGNS LIST 1, 301 Pipe joint 2 Pipe 3 Nipple 4, 104, 304, 404 Socket 4A, 4B, 4C, 404A, 404B, 404C, 404D, 404E Recess 4x Hose overlapping portion 4y, 304y Pipe overlapping portion 5 Resin member 5A Convex portion 10 Hose 21 Pipe main body 22 Pipe flare portion 31 Nipple main body 32 Nipple flange 41 First wall portion 42 Second wall portion 105 Resin material 200 Mold 305 Metal member 305A Recess 305F Metal tube portion 305G Intermediate portion 305H Bracket 305s, 305t, 305u, 305v, 305w Recess 405 Metal member 405F Cylinder

Claims (4)

Pipes and
With a cylindrical nipple,
a cylindrical socket in which the pipe and the nipple are disposed;
a resin member or a metal member disposed on the outside of the socket;
Equipped with
The pipe is
A pipe body;
A pipe flare portion formed at an end of the pipe body and having a width greater than an outer diameter of the pipe body;
having
The nipple is
A nipple body portion,
a nipple flange portion formed at an end of the nipple body portion and having an outer diameter larger than that of the nipple body portion;
having
The pipe flare portion and the nipple flange portion are in contact with each other inside the socket,
The socket is
a first wall portion and a second wall portion disposed in an axial direction of the socket, the first wall portion and the second wall portion being disposed between the pipe flare portion and the nipple flange portion;
In the socket, a portion that radially overlaps with the pipe body is crimped and fixed to the pipe body toward the radial inside, thereby forming a recess on an outer peripheral surface of the socket,
A pipe joint, characterized in that a convex portion fitted into the concave portion is formed on the resin member or the metal member. The socket is formed with a plurality of the recesses,
The recesses are arranged at intervals in a circumferential direction of the socket,
2. The pipe joint according to claim 1, wherein the resin member or the metal member is formed with a plurality of protrusions each fitted into a plurality of recesses. A method for manufacturing a pipe coupling comprising: a pipe having a pipe body portion and a pipe flare portion; a nipple having a nipple body portion and a nipple flange portion; a socket in which the pipe and the nipple are disposed; and a metal member disposed on the outside of the socket,
a first step of arranging the pipe and the nipple inside the socket and abutting the pipe flare portion against the nipple flange portion;
a second step of plastically deforming a wall portion of the socket on an opposite side of the pipe flare portion with respect to the nipple flange portion by pressing the wall portion of the socket against the nipple flange portion;
a third step of forming a metal member having a metal tubular portion on the outside of a portion of the socket that overlaps with the pipe body in the radial direction, and then pressing the tubular portion radially inward to swage and fix the portion of the socket that overlaps with the pipe body in the radial direction to the pipe body, forming a recess on an outer peripheral surface of the socket, and forming a metal member having a metal tubular portion with a protrusion that fits into the recess;
A method for manufacturing a pipe joint, comprising: A method for manufacturing a pipe fitting including a pipe having a pipe body portion and a pipe flare portion, a nipple having a nipple body portion and a nipple flange portion, a socket in which the pipe and the nipple are disposed, and a resin member disposed on the outside of the socket,
a first step of arranging the pipe and the nipple inside the socket and abutting the pipe flare portion against the nipple flange portion;
a second step of plastically deforming a wall portion of the socket on an opposite side of the pipe flare portion with respect to the nipple flange portion by pressing the wall portion of the socket against the nipple flange portion;
a third step of crimping a portion of the socket that overlaps with the pipe body in the radial direction toward the inside of the pipe body to form a recess in an outer peripheral surface of the socket;
a fourth step of forming a resin member having a protrusion fitted into the recess by disposing the crimped portion of the socket in a mold, injecting a molten resin material into the mold, and solidifying the resin material in a state in which the recess is filled with the molten resin material;
A method for manufacturing a pipe joint, comprising:

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